2BSX

Crystal structure of the Plasmodium falciparum purine nucleoside phosphorylase complexed with inosine

2BSX の概要

• エントリーDOI: 10.2210/pdb2bsx/pdb
• 分子名称: PURINE NUCLEOSIDE PHOSPHORYLASE, INOSINE (3 entities in total)
• 機能のキーワード: transferase, purine nucleoside phosphorylase, uridine phosphorylase, putative, glycosyltransferase
• 由来する生物種: PLASMODIUM FALCIPARUM
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 28230.54

構造登録者

Schnick, C.,Brzozowski, A.M.,Dodson, E.J.,Murshudov, G.N.,Brannigan, J.A.,Wilkinson, A.J. (登録日: 2005-05-24, 公開日: 2005-08-18, 最終更新日: 2024-11-20)

主引用文献

Schnick, C.,Robien, M.A.,Brzozowski, A.M.,Dodson, E.J.,Murshudov, G.N.,Anderson, L.,Luft, J.R.,Mehlin, C.,Hol, W.G.J.,Brannigan, J.A.,Wilkinson, A.J.
Structures of Plasmodium Falciparum Purine Nucleoside Phosphorylase Complexed with Sulfate and its Natural Substrate Inosine
Acta Crystallogr.,Sect.D, 61:1245-, 2005

PubMed Abstract: Purine metabolism in the parasite Plasmodium has been identified as a promising target for antimalarial therapies. Purine nucleoside phosphorylase (PNP) is part of a salvage pathway for the biosynthesis of purines, which are essential for parasite survival. Two crystal structures of PNP from Plasmodium falciparum (PfPNP) in two space groups, each with a single subunit in the asymmetric unit, are described here. One structure, refined to 2.4 A, has an empty nucleoside-binding site and a sulfate ion bound in the phosphate-binding pocket. The second structure, refined to 2.0 A, has the substrate inosine bound to the active centre. Structure comparison reveals alterations in the active site upon ligand binding. The new structures presented here specifically highlight the likely roles of Asp206 and two loops flanking the active site: the beta7-alpha6 loop (residues approximately 161-169) and the beta9-alpha8 loop (residues approximately 208-223). Comparison with PNP in complex with transition-state inhibitors suggests that the purine substrate moves towards the phosphate substrate, rather than vice versa, upon forming the transition state. The single-substrate-containing PfPNP structures also appear to be more flexible than PfPNP bound to inhibitors. Together, these structures serve as a basis for better understanding of ligand binding and mechanism that can be further exploited to optimize the specificity of anti-PfPNP drugs.

PubMed: 16131758
DOI: 10.1107/S0907444905020251

実験手法

X-RAY DIFFRACTION (2 Å)